"A new digger NPC named Estaсada has appeared in all safe zones.

He offers to exchange your Repair Parts for the following items:
Advanced Spare Parts and Tools;
Standard Spare Parts and Tools;
Unstable Anomalous Batteries;
Catalysts.

All offers, except for the catalysts, have purchase limits that will not be refreshed.

For the next two weeks, players will still be able to use Repair Parts to fix their gear, after which this option will be removed.
After these two weeks, the NPC will disappear and remaining Repair Parts will be automatically compensated in rubles."

The npc is next to the repair dude

Rough value for parts according to stalcraftdb:

Unstable Anomalous Battery - 15 rub per part
Advanced Spare Parts - 11 rub per part
Standard Spare Parts - 6-7 rub per part
Advanced Tools, catalyst - 5-6 rub per part
Standard tools 3 rub per part